Oxidative Addition of Haloheteroarenes to Palladium(0): Concerted versus S<sub>N</sub>Ar-Type Mechanism
作者:Bert U. W. Maes、Stefan Verbeeck、Tom Verhelst、Audrey Ekomié、Niklas von Wolff、Guillaume Lefèvre、Emily A. Mitchell、Anny Jutand
DOI:10.1002/chem.201406210
日期:2015.5.18
The kinetics of the oxidative additions of haloheteroarenes HetX (X=I, Br, Cl) to [Pd0(PPh3)2] (generated from [Pd0(PPh3)4]) have been investigated in THF and DMF and the rate constants have been determined. In contrast to the generally accepted concerted mechanism, Hammett plots obtained for substituted 2‐halopyridines and solvent effects reveal a reactionmechanism dependent on the halide X of HetX: